Reproducer project is an EAR, containing an EJB and a Servlet as EJB client. To rebuild: under "simple-ejb-ear" directory, do "mvn clean package" To test: 1) Start up an out-of-box (all default setting) EAP 7.0.9 or 7.1.4, add admin user 2) In EAP web management console ( http://localhost:9990 ), select "simple-ejb-ear/simple-ejb-ear-ear/target/simple-ejb-ear-ear.ear" to deploy 3) Open a browser and hit "http://localhost:8080/simple-ejb-ear-web/" I put 3 similar fields in CacheableObject.java for testing, the default constructor of the POJO initializes them as below: ------------------------------------------------------------------- public CacheableObject() { this._mutable_one = true; this._mutable_two = false; this._mutable_three = true; } ------------------------------------------------------------------- On client side: I create this object and set "_mutable_three" to false manually, so I sent "true, false, false" into EJB call. On server side: I print these values on receiving the call. On EAP 7.0.9: Client send: "true, false, false" Server received: "true, false, true" Conclusion-1: default constructor of CacheableObject class is called on both EJB client and EJB server side - correct behavior Conclusion-2: the value of transient field "_mutable_three" is not kept through the EJB call - correct behavior On EAP 7.1.4: Client send: "true, false, false" Server received: "false, false, false" Conclusion: default constructor of CacheableObject class is called on EJB client side, BUT NOT called on EJB server side - incorrect behavior